According to Fox News, Robert Bell Wallace died April 14, three days after he had a drink from a minibar and fell sick at Punta Cana's Hard Rock Hotel & Casino. Wallace, who was in town for his stepson's wedding, was examined by a hotel doctor and later hospitalized, Chloe Arnold, Wallace's niece, told the news outlet.

Schaup-Werner, a psychotherapist, also had taken a drink from the hotel minibar before her death, Fox News reported.

In a June 5 statement, Bahia Principe Hotels and Resorts said authorities determined that Schaub-Werner had died from a heart attack. Her husband "confirmed she had a history of heart conditions," the resorts said; however, family members told Fox News that she had been in good health.

Authorities also found that Schaub-Werner had experienced pulmonary edema, Fox News reported.

In response to the information that has been circulating in different media outletsregarding the two unfortunate events in the Dominican Republic, Bahia PrincipeHotels & Resorts would like to clarify the following: pic.twitter.com/Pg8QFmaq1L

On May 30, Edward Nathaniel Holmes, 63, and Cynthia Day, 49, of Prince George's County, Maryland, died at the Grand Bahia Principe La Romana resort, which is in the same complex as the Luxury Bahia Principe Bouganville, according to WLS-TV.

An autopsy reportedly revealed that they died from respiratory failure and pulmonary edema, WJZ-TV reported. Police found medication for high blood pressure in their room but no signs of violence, the station said.

In addition, two other Americans died mysteriously last year in the Dominican Republic.

In June 2018, Yvette Monique Sport, 51, of Glenside, Pennsylvania, died in bed at another Bahia Principe resort in Punta Cana, WTXF-TV reported. She also had taken a drink from the hotel minibar the night before, family members said.

The following month, David Harrison, 45, of Maryland, died at the Hard Rock Hotel & Casino – the same hotel where Wallace stayed months later, Harrison's wife told WTTG-TV.

Officials said both Sport and Harrison died of heart attacks, family members told the news outlets. An autopsy found that Harrison had experienced pulmonary edema, as well, WTTG reported.

According to CBS News, the Federal Bureau of Investigation "is assisting Dominican authorities" as they look into the deaths. So far, investigators reportedly have not found any evidence that the incidents are connected.